[nggallery] Password protection ?

Hi,
I’m using nggallery on my site, where almost each post has a gallery in it, using the [gallery=1] syntax. Although just using only a smalll portion of the functionality; I love it. Thanks for the great work.

I recently got questions, related to all our pictures on the site being public.
Some picture we would prefer to make private, while still allowing visitors to read the post, take advantage of rss etc.
Is there a way to password protect just a gallery inside a post, in such a way that regular visitors can only see the text, with the option something along the lines of “to see the picture, please enter a password here”.
Ideally not requiring site registration, but just a simple password I can mail out to my family and friends.
Thanks,
Arnaud